WO2010008018A1

WO2010008018A1 - Horizontal multistage press

Info

Publication number: WO2010008018A1
Application number: PCT/JP2009/062799
Authority: WO
Inventors: 禮二山田; 泰行大平; 文雄栗田; 峰男増田
Original assignee: 株式会社太平製作所
Priority date: 2008-07-16
Filing date: 2009-07-15
Publication date: 2010-01-21
Also published as: TWI480151B; TW201020102A; US20110120654A1; US7992614B2

Abstract

Hot-pressing is performed by driving and controlling pressing cylinders (150LH, 150RH, 150LL, 150RL) separately so that even if, for example, the size or the material of the board to be processed (W1) changes, the overall thickness of the processed body (W) after hot-pressing is within a prescribed range of permissible dimensions over the entire pressed surface (141). Each pressing cylinder (150LH, 150RH, 150LL, 150RL) is provided with a pressing cylinder linear encoder (151LH, 151RH, 151LL, 151RL) that detects the amount of decrease in overall thickness of the processed body (W) as the amount of ram movement and with a pressing cylinder pressure sensor (152LH, 152RH, 152LL, 152RL) that detects the pressing force of press plates (140F, 140B) as internal cylinder pressure in the pressing cylinders (150LH, 150RH, 150LL, 150RL). The rams (153LH, 153RH, 153LL, 153RL) of the respective pressing cylinders (150LH, 150RH, 150LL, 150RL) are each affixed to the press plates (140F, 140B) so that the pressing position of the press plates (140F, 140B) with respect to the pressed surface (141) does not vary. The pressing cylinders (150LH, 150RH, 150LL, 150RL) are driven and controlled separately to perform hot-pressing, so that even if, for example, the size or the material of the board to be processed (W1) changes, the overall thickness of the processed body (W) after hot-pressing is within a prescribed range of permissible dimensions over the entire pressed surface (141). A horizontal multistage press is thereby provided that, by controlling the operation of multiple pressing cylinders separately, can keep the thickness of a board (laminate board) after hot-pressing within a range of permissible dimensions even if, for example, the size or material of the conveyed board changes. A horizontal multi-stage press is also provided, which, by controlling the operation of multiple pressing cylinders separately or jointly, can keep the thickness of a board (laminate board) after hot-pressing within a range of permissible dimensions without moving or adjusting the pressing cylinder pressing positions, when, for example, the size of the conveyed board changes, and can also adapt to changes in board material.

Description

Horizontal multi-stage press

The present invention relates to a horizontal multi-stage press apparatus for heating and pressing a plate material.

In a multi-stage press machine (hot press) that heats and presses plate materials (processed plate materials) such as plywood, decorative plates, and veneer veneers to form a predetermined plate thickness, each plate stands between a plurality of hot plates. There is known a horizontal type that is carried in a state and heated and pressed by driving at least one of press plates disposed on both outer sides. This horizontal method (horizontal hot press) is a plate or hot plate compared to the vertical method (vertical hot press) that heats and presses the plates and hot plates held in the horizontal direction alternately in the vertical direction. It has the advantage that molding unevenness (uneven thickness) due to its own weight is less likely to occur.

In such a horizontal hot press, two pressing cylinders (for example, hydraulic pressure) that are loaded into the press device using one of the long sides (lower side) of the rectangular plate material as a conveyance reference surface and are arranged in the longitudinal direction (left-right direction). Generally, the pressing position of the cylinder) is heated and pressed so as to match the center position in the short side direction (vertical direction) of the plate material. However, in recent years, the size of the plate material has been diversified. For example, not only the commonly known 6 scales (6 scales (1.8 m) × 3 scales (0.9 m)), but also the common name 8 scales (8 scales). (2.4 m) × 4 scales (1.2 m)) and commonly called 10 scales (10 scales (3 m) × 5 scales (1.5 m)) are also on the market.

As described above, when the size of the loaded plate material changes, the pressing position of the pressing cylinder with respect to the plate material fluctuates, the inclination of the plate material increases, and the thickness after thermocompression bonding may become uneven depending on the part. So far, the pressing position of the pressing cylinder is adjusted (moved up and down) with respect to the pressing surface of the pressing plate by a movement adjusting mechanism (for example, an elevating hydraulic cylinder) according to the size of the loaded plate material. The relative pressing position of the pressing cylinder is not changed (see Patent Document 1).

JP 2007-313864 A

As in Patent Document 1, it is possible to cope with the diversification of the size of the plate material to some extent by moving and adjusting the pressing position of the pressing cylinder with respect to the pressing plate (pressing surface). However, since the adjustment of the movement of the pressing cylinder relative to the pressing plate (pressing surface) is structurally limited to one direction (usually in the vertical direction), precise thickness adjustment (uniformization) is difficult, especially the corners of rectangular plates. The thickness tends to be uneven at the part.

In addition, the plate material has different properties depending on the material (wood) as well as its size. For example, a hard plywood (hard material) such as coral and lauan that has a relatively large elasticity and repulsive force (hard material) tends to tilt or become uneven due to the rebound (springback) phenomenon. . On the other hand, for soft plywood, such as cedar and paulownia, which has a relatively low elasticity and repulsive force (soft material), the thickness is easily reduced by pressing. Thickness tends to be thinner than specified (particularly at the cylinder pressing position). Therefore, only the pressing position movement adjusting mechanism of the pressing cylinder cannot sufficiently cope with such a difference due to the size and material of the plate material, and the thickness of the laminated plywood, which is the plate material after thermocompression bonding, is increased due to the occurrence of inclination. Unevenness of thickness and non-standard thickness at the cylinder pressing position were likely to occur.

The first problem of the present invention is that the thickness of the plate material (laminated plywood) after thermocompression bonding is controlled by controlling the driving of the plurality of pressing cylinders individually, for example, even if the size or material of the loaded plate material changes. Is to provide a horizontal multi-stage press apparatus capable of holding the pressure within a range of allowable dimensions.
In addition, the second problem of the present invention is to control the movement of the plurality of pressing cylinders individually or collectively, for example, to move and adjust the pressing position of the pressing cylinder when the size of the loaded plate material changes. It is an object of the present invention to provide a horizontal multi-stage press apparatus that can maintain the thickness of a plate material (laminated plywood) after thermocompression bonding within a range of allowable dimensions and can be adapted to changes in the material of the plate material.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a horizontal multi-stage press apparatus according to the first invention is
A plate is formed by applying adhesives to the bonding surface of a single plate and carrying it in an upright state between a plurality of hot plates and stacking them in the thickness direction. In the horizontal multi-stage press device that presses and presses the plate material by pressing from the outside in the overlapping direction of the body, and collectively manufactures a plurality of wooden laminated plywoods,
A plurality of pressing cylinders arranged at a plurality of positions different from each other with respect to the plate surface of the plate material, and pressing the object to be processed from the overlapping direction;
A cylinder controller that individually controls the driving of each of the plurality of pressing cylinders;
It is characterized by providing.

More specifically,
A plate is formed by applying adhesives to the bonding surface of a single plate and carrying it in an upright state between a plurality of hot plates and stacking them in the thickness direction. In the horizontal multi-stage press apparatus that heat-presses the plate material by driving at least one of the pressing plates arranged on both outer sides of the body overlapping direction, and collectively manufactures a plurality of wooden laminated plywoods,
A plurality of pressing cylinders disposed at a plurality of positions different from each other with respect to the pressing surface of the pressing plate, and driving the pressing plate to press the object to be processed from the overlapping direction, respectively;
A cylinder controller that individually controls the driving of each of the plurality of pressing cylinders;
Can be provided.

In order to solve the above-mentioned problem, a specific aspect of the horizontal multi-stage press device according to the first invention is as follows:
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. Combining them together constitutes the object to be processed, and by driving at least one of the pressing plates disposed on both outer sides of the object to be processed in the overlapping direction, the plate material is thermocompression-bonded, and a plurality of wooden laminated plywoods are bundled together. In the horizontal multi-stage press machine manufactured by
An opening / closing cylinder that is disposed near the center on the pressing surface of the pressing plate, and closes / opens the pressing plate by approaching / separating it,
It is arranged at a plurality of different positions with respect to the pressing surface of the pressing plate so as to surround the opening / closing cylinder (radially), and drives the pressing plate to press the objects to be processed from the overlapping direction. A plurality of pressing cylinders;
A cylinder controller that individually controls the driving of each of the plurality of pressing cylinders;
It is characterized by providing.

In these horizontal multi-stage press devices, for example, even when the size or material of the loaded plate material changes, by individually controlling the driving of a plurality of pressing cylinders (for example, four hydraulic cylinders (fluid pressure cylinders)), The thickness of the plate material (laminated plywood) after thermocompression bonding can be maintained within the allowable dimension range. In addition, the total thickness of the object to be processed (plate material + hot plate) can be detected by the driving distance of the pressing cylinder, not the thickness of individual plate materials (laminated plywood) after thermocompression bonding, thus reducing the time required for detection. Can do. Therefore, it is possible to prevent the plate material from being tilted and resulting in uneven thickness due to the delay in control, or the stoppage of the pressing cylinder from being delayed and being out of specification.

Moreover, in addition to the pressing cylinder, when an opening / closing cylinder dedicated to opening / closing the pressing plate (for example, one hydraulic cylinder (fluid pressure cylinder)) is provided, an opening / closing cylinder that requires high-speed movement over a long span and a short span are used. A pressing cylinder that requires fine movement can be used properly. Therefore, the working efficiency of the hot press is improved by speeding up the opening / closing operation of the pressing plate, and the driving control of the pressing cylinder can be performed with high accuracy without being influenced by the opening / closing operation of the pressing plate.

Further, the plurality of pressing cylinders are arranged (radially) with respect to the pressing surface of the pressing plate so as to surround the opening / closing cylinder. As a result, even if a plurality of pressing cylinders are simultaneously pressed against the pressing plate, the plate material (that is, the pressing plate) is less likely to be inclined. For example, when a plurality of pressing cylinders are arranged so as to be point-symmetrical and / or line-symmetrical with respect to the open / close cylinder, the driving pressure of each pressing cylinder acts on the pressing plate simultaneously and evenly. become.

The plurality of pressing cylinders are either a fixed type in which the pressing position is not changed, or a movable type in which the pressing position can be changed (lifted up and down) in a direction (for example, the vertical direction) intersecting (orthogonal) the plate material loading direction. Alternatively, a composite type in which both are mixed may be used. In that case, when all or some of the plurality of pressing cylinders are fixed, the pressing position movement adjusting mechanism of the pressing cylinder can be simplified.

Further, the plurality of pressing cylinders may be arranged in a distributed manner such that the pressing positions with respect to the plate surface of the plate material (the pressing surface of the pressing plate) are arranged in a plurality of rows (for example, two rows) along the conveyance reference surface. it can. In this way, by arranging a plurality of pressing cylinders in a plurality of rows along the conveyance reference plane, the drive pressure and driving distance of the pressing cylinders can be reduced with respect to a group of pressing cylinders at the same distance from the conveyance reference plane. Common settings can be made, and press control can be executed smoothly.

The cylinder control unit includes a distance detection unit that detects driving distances when the plurality of pressing cylinders press the workpiece, and a pressure detection unit that detects driving pressures applied to the plurality of pressing cylinders, respectively. And the driving distance of each pressing cylinder detected by the distance detecting means is evenly distributed within a predetermined setting range so that the thickness of the entire object to be processed after heating and pressing is within the allowable dimension range. It is desirable to individually drive and control each pressing cylinder so as to approach each other.

In this way, since the driving pressure applied to the pressing cylinder and the driving distance of the pressing cylinder are detected and controlled for each pressing cylinder, immediately based on the detection values (driving pressure and driving distance) obtained from each pressing cylinder. The drive of each pressing cylinder can be controlled individually, and the control can be simplified and speeded up. For example, a pressure sensor for detecting the cylinder internal pressure of the pressing cylinder can be used as the pressure detecting means for detecting the driving pressure applied to the pressing cylinder. Further, as a distance detecting means for detecting the driving distance of the pressing cylinder, for example, a linear encoder that detects the amount of ram movement of the pressing cylinder can be used.

In such a horizontal multi-stage press device, for example, in the case of a plywood (hard material) that is a hard material and has high elasticity and repulsion,
The cylinder control unit
When the driving pressure of each pressing cylinder reaches a predetermined target range along with the pressing drive of a plurality of pressing cylinders, the driving distance of each pressing cylinder detected by the distance detecting means is within the set range and is uniform without deviation In the uniform range that can be regarded as, it is possible to stop the pressing drive of the plurality of pressing cylinders.

Specifically, the cylinder control unit
When the driving pressure of each pressing cylinder reaches a predetermined target range along with the pressing drive of a plurality of pressing cylinders, the driving distance of each pressing cylinder detected by the distance detecting means is within the set range and is uniform without deviation In the uniform range that can be regarded as, while stopping the pressing drive of the plurality of pressing cylinders,
When the driving distance of any pressing cylinder is not within the uniform range, the driving pressure of the corresponding pressing cylinder is increased by expanding (expanding) the upper and lower limits of the target range related to the driving pressure of the pressing cylinder. Alternatively, the pressure can be reduced.

欅 Plywood, etc. (hard material) that is hard and has a relatively large elasticity and repulsive force (hard material), such as Lauan, tends to tilt due to the rebound (spring back) phenomenon. Therefore, first, the driving pressure of each pressing cylinder is made to reach the target range, and if the driving distance of each pressing cylinder at that time is within the set range and within the uniform range, the inclination of the plate material is 0 or very small. Since it is considered, the pressing drive of the pressing cylinder is stopped. On the other hand, if the driving distance of one of the pressing cylinders is not within the uniform range, it is considered that the inclination to be corrected (relaxed) has occurred in the plate material. The drive pressure of the corresponding pressing cylinder is increased (or reduced) by expanding to an allowable range. In this way, the driving of the pressing cylinder is individually controlled with emphasis on pressure, so that the overall thickness of the object to be processed (plate material + hot plate) is allowed to a predetermined tolerance, even if the plate material is temporarily inclined due to the return phenomenon in the hard material. Since the inclination of the plate material can be corrected (relaxed) in the process of finishing the dimensions, the generation of defective products can be suppressed and the product yield can be improved.

On the other hand, for example, in the case of a plywood (soft material) that is soft and has low elasticity and repulsion,
The cylinder control unit
When the driving distance of each pressing cylinder reaches a set range with the pressing driving of the plurality of pressing cylinders, the driving pressure of each pressing cylinder detected by the pressure detecting means is within a predetermined target range, and the distance detecting means When the driving distances of the respective pressing cylinders detected in the above are within a uniform range that can be regarded as uniform without deviation, the pressing driving of the plurality of pressing cylinders can be stopped.

Specifically, the cylinder control unit
When the driving distance of each pressing cylinder reaches the lower limit of the setting range with the pressing driving of the plurality of pressing cylinders, the driving pressure of each pressing cylinder detected by the pressure detection means is below the upper limit of the predetermined target range, And when the driving distance of each pressing cylinder detected by the distance detecting means is within a uniform range that can be regarded as uniform without deviation, the pressing driving of the plurality of pressing cylinders is stopped,
When the driving distance of any pressing cylinder is not within the uniform range, the driving pressure can be increased if the driving distance of the corresponding pressing cylinder is equal to or less than the upper limit of the setting range.

For plywood, etc. (soft material) that is soft and has little elasticity and repulsion, such as cedar and paulownia (soft material), the thickness is easily reduced by pressing, and the thickness after thermocompression bonding even at the specified driving pressure Tends to be thinner than specified (particularly at the cylinder pressing position). Therefore, when the driving distance of each pressing cylinder reaches the set range (lower limit), the driving pressure of each pressing cylinder is within a predetermined target range (below the upper limit of the target range), and the driving distance of each pressing cylinder Is within a uniform range, the inclination of the plate material is considered to be 0 or very small, and the pressing drive of the pressing cylinder is stopped. On the other hand, if the driving distance of one of the pressing cylinders is not within the uniform range, it is considered that the inclination to be corrected (relaxed) is occurring in the plate material, so the driving distance of the corresponding pressing cylinder is less than the upper limit of the setting range. If so, the driving pressure is increased. As described above, since the driving of the pressing cylinder is individually controlled with emphasis on distance, the entire thickness of the object to be processed (plate material + hot plate) is predetermined while preventing (monitoring) excessive pressing particularly on the soft material. Since the inclination of the plate material can be corrected (relieved) in the process of finishing to the allowable dimension, the generation of defective products can be suppressed and the product yield can be improved.

By the way, whether or not the driving distance of the pressing cylinder is within the uniform range is determined by the difference in the driving distance of each pressing cylinder detected by the distance detecting means, or the plate material calculated from the detected value of the driving distance. It can be determined by the magnitude of the inclination.

Thus, in the process of finishing the overall thickness of the object to be processed (plate material + hot plate) to a predetermined allowable dimension, the difference in driving distance or the inclination of the plate material is obtained from the detected value of the driving distance of each pressing cylinder. It can be determined whether or not it is within the uniform range, and the inclination of the plate material can be corrected (relaxed) quickly, so that the occurrence of defective products can be suppressed and the product yield can be dramatically improved. When determining whether or not the driving distance is within the uniform range based on the difference in the driving distance, the driving distance difference (maximum allowable width; for example, 20 mm) used for the determination is the width of the driving distance setting range. Usually, it is set smaller (for example, 1/2) than (maximum allowable width; for example, 40 mm = ± 20 mm).

Next, in order to solve the above-mentioned problem, the horizontal multi-stage press device according to the second invention is:
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. In the horizontal multi-stage press apparatus that constitutes the object to be processed by combining them, heats and presses the plate material by pressing from the outside in the overlapping direction of the objects to be processed, and collectively manufactures a plurality of wooden laminated plywoods,
A plurality of pressing cylinders arranged at a plurality of positions different from each other with respect to the plate surface of the plate material, and pressing the object to be processed from the overlapping direction;
A cylinder control unit for controlling the driving of the plurality of pressing cylinders individually or collectively,
Among the plurality of pressing cylinders, the pressing cylinder disposed at least near the conveyance reference plane of the plate material is configured such that the pressing position with respect to the plate surface of the plate material is unchanged (constitutes a fixed pressing cylinder). And

More specifically,
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. Combining them together constitutes the object to be processed, and by driving at least one of the pressing plates disposed on both outer sides of the object to be processed in the overlapping direction, the plate material is thermocompression-bonded, and a plurality of wooden laminated plywoods are bundled together. In the horizontal multi-stage press machine manufactured by
A plurality of pressing cylinders disposed at a plurality of positions different from each other with respect to the pressing surface of the pressing plate, and driving the pressing plate to press the object to be processed from the overlapping direction, respectively;
A cylinder control unit for controlling the driving of the plurality of pressing cylinders individually or collectively,
Of the plurality of pressing cylinders, at least the pressing cylinder disposed near the conveyance reference surface of the plate material may have a constant pressing position with respect to the pressing surface of the pressing plate (constitutes a fixed pressing cylinder). is there.

Moreover, in order to solve the said subject, the specific aspect of the horizontal type multistage press apparatus which concerns on 2nd invention is as follows.
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. Combining them together constitutes the object to be processed, and by driving at least one of the pressing plates disposed on both outer sides of the object to be processed in the overlapping direction, the plate material is thermocompression-bonded, and a plurality of wooden laminated plywoods are bundled together. In the horizontal multi-stage press machine manufactured by
An opening / closing cylinder that is disposed near the center on the pressing surface of the pressing plate, and closes / opens the pressing plate by approaching / separating it,
It is arranged at a plurality of different positions with respect to the pressing surface of the pressing plate so as to surround the opening / closing cylinder (radially), and drives the pressing plate to press the objects to be processed from the overlapping direction. A plurality of pressing cylinders;
A cylinder control unit for controlling the driving of the plurality of pressing cylinders individually or collectively,
Among the plurality of pressing cylinders, at least the pressing cylinder disposed closer to the conveyance reference plane of the plate material than the opening / closing cylinder has a fixed pressing position with respect to the pressing surface of the pressing plate (constitutes a fixed pressing cylinder). It is characterized by that.

In these horizontal multi-stage press devices, for example, even when the size or material of the loaded plate material changes, the drive of a plurality of pressing cylinders (for example, four hydraulic cylinders (fluid pressure cylinders)) is controlled individually or collectively. By doing so, the thickness of the plate material after thermocompression bonding can be maintained within the allowable dimension range. Accordingly, it is not necessary to provide a pressing position movement adjusting mechanism for moving and adjusting the pressing position of at least the pressing cylinder that is a sturdy and heavy structure disposed near the conveyance reference plane of the plate material. Can be simplified, and the manufacturing cost required for assembly and installation, and the running cost required for operation and repair can be reduced. In addition, the total thickness of the object to be processed (plate material + hot plate) can be detected by the driving distance of the pressing cylinder, not the thickness of individual plate materials (laminated plywood) after thermocompression bonding, thus reducing the time required for detection. Can do. Therefore, it is possible to prevent the plate material from being tilted and resulting in uneven thickness due to the delay in control, or the stoppage of the pressing cylinder from being delayed and being out of specification.

In addition, at least one of the plurality of (for example, two out of four) pressing cylinders may be configured in a fixed manner in which the pressing position is unchanged with respect to the plate surface of the plate material (the pressing surface of the pressing plate). That's fine. Therefore, even when the remaining (for example, two) pressing cylinders are configured to be movable so that the pressing position can be changed (lifted / lowered) in a direction (for example, the vertical direction) intersecting (orthogonal) with the plate material loading direction, It is possible to simplify the pressing position movement adjusting mechanism of the pressing cylinder.

The plurality of pressing cylinders are
A plurality of fixed pressing cylinders arranged in a (lower) region closer to the conveyance reference plane of the plate (rather than the open / close cylinder), and the pressing position with respect to the plate surface of the plate (the pressing surface of the pressing plate) is unchanged;
(Similarly) It is located in the area (upper) far from the conveyance reference plane, and the pressing position on the plate surface of the plate (the pressing surface of the pressing plate) can be changed (up and down) with respect to the pressing position of the fixed pressing cylinder. And a plurality of movable pressing cylinders.

Thus, by using a part of the plurality of pressing cylinders (for example, two of the four cylinders) as fixed pressing cylinders, it is possible to simplify the pressing position movement adjusting mechanism of the pressing cylinders. In addition, the position of the pressing cylinder on the side far from the conveyance reference plane can be changed as a movable pressing cylinder, so that when the size of the plate changes, it is relative to the plate (long side opposite to the conveyance reference plane). Even if the positional relationship fluctuates, the pressing position of the movable pressing cylinder can be changed. For example, an elevating hydraulic cylinder (fluid pressure cylinder) can be used as the pressing position movement adjusting mechanism of the movable pressing cylinder. In this way, when the size of the plate material changes, the adjustment width of the pressing cylinder driving pressure (target value tolerance) and the adjustment distance of the pressing cylinder driving distance (setting value tolerance) are kept small. be able to.

Alternatively, the plurality of pressing cylinders are composed of an even number of fixed pressing cylinders whose pressing positions with respect to the pressing surface of the pressing plate are unchanged, and are arranged so as to be point-symmetrical and / or line-symmetrical with respect to the open / close cylinder. There is a case.

Thus, by making all the pressing cylinders fixed, it is possible to eliminate the need to provide a pressing position movement adjusting mechanism for the pressing cylinders, thereby further simplifying. Further, when the plurality of pressing cylinders are arranged so as to be point-symmetrical and / or line-symmetrical with respect to the open / close cylinder, the driving pressure of each pressing cylinder acts on the pressing plate simultaneously and evenly. become.

The front view which shows an example of the horizontal type | mold multistage press apparatus which concerns on this invention. The top view which shows an example of the press structure of FIG. The side view of FIG. The side view which shows a press closed state. The front view which shows an example of the arrangement | positioning relationship of a press control system. FIG. 6 is a hydraulic circuit diagram of FIG. 5. FIG. 6 is a block diagram showing the electrical configuration of FIG. 5. The flowchart which shows a press preparation process. The flowchart which shows the press processing subroutine for hard materials. The flowchart which shows the press processing subroutine for soft materials. The hydraulic circuit diagram which shows the modification of FIG. The flowchart which shows the modification of FIG. 11 is a flowchart showing a modification of FIG. The front view which shows the other example of arrangement | positioning relationship of a press control system. The hydraulic circuit diagram of FIG. FIG. 15 is a block diagram showing the electrical configuration of FIG. The flowchart which shows a press preparation process. The hydraulic circuit diagram which shows the modification of FIG. The front view which shows the further another example of arrangement | positioning relationship of a press control system. FIG. 20 is a hydraulic circuit diagram of FIG. 19. FIG. 20 is a block diagram showing an electrical configuration of FIG. 19. The hydraulic circuit diagram which shows the modification of FIG. The front view which shows the further another example of arrangement | positioning relationship of a press control system. The hydraulic circuit diagram of FIG. FIG. 24 is a block diagram showing the electrical configuration of FIG. The hydraulic circuit diagram which shows the modification of FIG. The hydraulic circuit diagram which shows the further another example of a press control system. FIG. 28 is a block diagram showing the electrical configuration of FIG. The flowchart which shows the press processing subroutine for hard materials. The flowchart which shows the press processing subroutine for soft materials. The hydraulic circuit diagram which shows the modification of FIG. The hydraulic circuit diagram which shows the further another example of a press control system. FIG. 33 is a block diagram showing an electrical configuration of FIG. 32. FIG. 33 is a hydraulic circuit diagram showing a modification of FIG. 32.

Example 1
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a front view showing an example of a horizontal multi-stage press apparatus including a press structure. A horizontal multi-stage press apparatus 1 shown in FIG. 1 has a rectangular plate shape in which a large number of horizontal plates, such as a plywood board and a decorative board, are laminated by applying an adhesive to the joining surfaces of a plurality of veneer single plates. The to-be-processed board | plate material W1 (plate | board material) is hold | maintained in the standing state by the loader part 200 (carry-in part), and is carried in to the hot press part 100 (heating-pressing part). The processed plate material W2 (laminated plywood), which has been heated and pressurized for a predetermined time by the hot press unit 100 and formed to a predetermined thickness, is returned to the horizontal state again by the unloader unit 300 (unloading unit) and unloaded.

The hot press unit 100 is provided with a pair of upper and lower

horizontal beams

101L, 101R, 102L, and 102R arranged at predetermined intervals in the vertical direction (standing direction) and the horizontal direction (conveying direction; carrying-in direction). A pair of fixed

frames

103F and 103B (see FIG. 3) are disposed in the front-rear direction (pressing direction). Moving

rollers

105L and 105R (moving members) are attached to the

rails

104L and 104R laid on the upper

horizontal beams

101L and 101R. Between the

rails

104L and 104R, a plurality of hot plates 130 and a pair or single (for example, a pair)

pressing plates

140F and 140B (see FIG. 3) are suspended and supported via moving

rollers

105L and 105R. Has been. A plurality of (for example, four) pressing cylinders 150LH, 150RH, 150LL, and 150RL (hydraulic cylinders; fluid pressure cylinders) are inserted into the fixed

frames

103F and 103B at predetermined intervals, and the rams 153LH, 153RH, and 153LL are inserted. , 153RL are attached to the

press plates

140F and 140B (see FIG. 3). Note that one of the fixed

frames

103F and 103B may also serve as a pressing plate.

Below the hot plate 130, a roller conveyor 160 (conveyance body) that supports the plate material W <b> 1 in an upright state from below and carries it into the hot press unit 100 from the loader unit 200 is disposed. The roller conveyor 160 includes a plurality of (for example, four) claw rollers 161 having a width in the front-rear direction across all the carry-in paths K (see FIG. 3) in order to carry in the plate material W1. It is arranged on a machine casing 108 that spans 102L and 102R. The processed plate material W1 carried in from the loader unit 200 by the roller conveyor 160 is heated and pressure-bonded by the hot plate 130, and then becomes a processed plate material W2, which is again carried out by the roller conveyor 160 to the unloader unit 300.

A loader unit 200 is disposed on the carry-in side (upstream side (rear side) in the transport direction) of the hot press unit 100. In the loader unit 200, a pair of left and right chain conveyors 202 </ b> L and 202 </ b> R (endless bodies) are disposed on the frame 201 with a predetermined interval. The

chain conveyors

202L and 202R are provided with loader shelves 203. On the gantry 201, a carry-in conveyor 210 (carry-in body) for delivering the plate material W1 in a standing state to the roller conveyor 160 of the hot press unit 100 is disposed. The carry-in conveyor 210 includes a plurality of (for example, four) claw rollers 211 having a width in the front-rear direction that straddles all the processed plate materials W1 (carry-in path K; see FIG. 3).

On the carry-out side (downstream side (front side) in the transport direction) of the hot press unit 100, an unloader unit 300 is disposed. In the unloader section 300, a pair of left and

right chain conveyors

302L and 302R (endless bodies) are arranged on the frame 301 with a predetermined interval. An unloader shelf 303 is provided on the

chain conveyors

302L and 302R. On the gantry 301, an unloading conveyor 310 (unloading body) for receiving the processed plate material W2 in the standing state from the roller conveyor 160 of the hot press unit 100 is disposed. The carry-out conveyor 310 includes a plurality of (for example, four) claw rollers 311 having a width in the front-rear direction across all the processed plate materials W2.

2 is a plan view showing an example of a press structure, FIG. 3 is a side view thereof, and FIG. 4 is a side view showing a press closed state. In the hot press unit 100 (heating and pressing unit; press structure) shown in FIG. 2, fixed

frames

103F and 103B are fixedly arranged at the front and rear positions in the horizontal direction, and above the fixed

frames

103F and 103B in a parallel state.

Horizontal beams

101L and 101R are provided. A plurality of moving

rollers

105L and 105R (moving members) movable in the front-rear direction are provided on the

rails

104L and 104R provided on the cross beams 101L and 101R. As is well known, the moving

rollers

105L and 105R move in a rolling state of a roller or a sliding state by surface contact, and may be any means that can move linearly in the horizontal direction.

Each moving

roller

105L, 105R is connected to the upper side of the hot plate 130 in order to heat the plate material W1 erected in the vertical direction when the press is closed, and the plurality of hot plates 130 are arranged in the front-rear direction. A hot plate group is formed by being suspended in parallel. Further, when the press is released, the adjacent hot plates 130 are positioned parallel to the transport direction so as to maintain a predetermined interval so that the processed plate material W1 can be inserted between the hot plates 130 in the hot plate group. In addition, steam, hot oil, etc. are supplied / exhausted in the inside of the hot plate 130, and the temperature is maintained according to the kind of to-be-processed board | plate material W1.

Also, a pair of front and

rear press plates

140F and 140B are provided which are connected to the hot plate 130 of the hot plate group, move the hot plate 130 in the front-rear direction, and perform press closing and press opening. The

press plates

140F and 140B are disposed to face the respective heat plates 130 located on both sides in the front-rear direction of the hot plate group, and the upper sides of the

press plates

140F and 140B are connected to the moving

rollers

105L and 105R to move forward and backward. Suspend freely in the direction. In addition, the

press plates

140F and 140B are connected to the rams 153LH, 153RH, 153LL, and 153RL of the press cylinders 150LH, 150RH, 150LL, and 150RL provided in the fixed

frames

103F and 103B, and the front and rear directions are provided by the rams 153LH, 153RH, 153LL, and 153RL. It can be reciprocated freely. 2 are reciprocated in the front-rear direction with respect to the fixed

frames

103F and 103B.

In this embodiment, the rams 153LH, 153RH, 153LL, and 153RL of the respective pressing cylinders 150LH, 150RH, 150LL, and 150RL are respectively configured so that the pressing positions of the

pressing plates

140F and 140B with respect to the pressing surface 141 are unchanged. It is fixed to 140B. An open / close cylinder 180 (hydraulic cylinder; fluid pressure cylinder) that closes and opens the

press plates

140F and 140B by approaching and separating them is disposed on both outer sides of the

press plates

140F and 140B and in the vicinity of the center of the press surface 141. (See FIGS. 3 and 4).

Therefore, the upright processed plate material W1 is carried between the hot plates 130 with one of the long sides of the rectangular shape (lower side) as the conveyance reference plane B (see FIG. 5). A large number of the to-be-processed plate material W1 and the hot plate 130 are overlapped in the thickness direction to constitute an object to be processed W for hot pressing. Prior to the heat pressing process of the workpiece W (processed plate material W1) by the pressing cylinders 150LH, 150RH, 150LL, and 150RL, the open / close cylinder 180 closes the

pressing plates

140F and 140B. The pressing cylinders 150LH, 150RH, 150LL, and 150RL have a predetermined allowable dimension over the entire pressing surface 141, for example, even if the size and material of the processing target plate material W1 change. The heating and pressing process is performed under individual drive control so as to be within the range. When the heat pressing process by the pressing cylinders 150LH, 150RH, 150LL, and 150RL is completed, the opening / closing cylinder 180 opens the

pressing plates

140F and 140B.

Next, the specific structure of the press control system according to the present invention is shown in FIGS. FIG. 5 is a front view showing an example of the arrangement relationship of the press control system, FIG. 6 is a hydraulic circuit diagram thereof, and FIG. 7 is a block diagram showing its electrical configuration.

As shown in the layout diagram of FIG. 5, the four pressing cylinders 150LH, 150RH, 150LL, and 150RL are arranged with respect to the pressing surface 141 of the

pressing plates

140F and 140B so as to surround the opening / closing cylinder 180 (radially). Has been. Specifically, the pressing cylinders 150LH, 150RH, 150LL, and 150RL are arranged so as to be point-symmetrical and line-symmetric with respect to the opening / closing cylinder 180, and thus are applied to the pressing cylinders 150LH, 150RH, 150LL, and 150RL. The driving pressure (that is, the cylinder internal pressure) acts simultaneously and evenly on the

pressing plates

140F and 140B.

In addition, the four pressing cylinders 150LH, 150RH, 150LL, and 150RL are dispersedly arranged so that the pressing positions of the

pressing plates

140F and 140B with respect to the pressing surface 141 are aligned in two rows along the conveyance reference surface B (roller conveyor 160). Has been. That is, the upper left pressing cylinder 150LH and the upper right pressing cylinder 150RH arranged in the upper region farther from the conveyance reference plane B than the open / close cylinder 180 are the upper left row and the lower left pressing cylinder 150LL arranged in the lower region near the conveyance reference plane B and The lower right pressing cylinder 150RL constitutes the lower row. As described above, by uniformly disposing the pressing cylinders 150LH, 150RH, 150LL, and 150RL with respect to the pressing surface 141 of the

pressing plates

140F and 140B, it is difficult for the processed plate material W1 to be inclined during the heating and pressing.

The pressing cylinders 150LH, 150RH, 150LL, and 150RL are pressure cylinder linear encoders 151LH and 151RH that detect the amount of decrease in the overall thickness of the workpiece W as the amount of movement (drive distance) of the rams 153LH, 153RH, 153LL, and 153RL. , 151LL, 151RL (movement amount detection means; distance detection means), and pressure cylinder pressure sensor 152LH for detecting the pressing force of the

pressing plates

140F, 140B as the cylinder internal pressure (driving pressure) of the pressing cylinders 150LH, 150RH, 150LL, 150RL. , 152RH, 152LL, 152RL (pressure detection means). On the other hand, the open / close cylinder 180 is provided with an open / close cylinder pressure switch 181 (pressure detection means) for detecting the closing / opening of the

press plates

140F, 140B by the level of the cylinder internal pressure. A ram movement amount display unit 106LH, 106RH, 106LL, 106RL and a cylinder internal pressure display unit 107LH, 107RH, 107LL, 107RL are provided, and linear encoders 151LH, 151RH, 151LL, 151RL and pressure sensors 152LH, 152RH, 152LL, 152RL are provided. The detected value is displayed via a transmitter (transmitter) or the like.

As shown in the hydraulic circuit diagram of FIG. 6, there is a four-port three-position switching between the variable displacement type press cylinder hydraulic pump 154 driven by the electric motor 108 and each press cylinder 150LH, 150RH, 150LL, 150RL. The electromagnetic switching valves 155LH, 155RH, 155LL, 155RL of the type are respectively arranged. Each electromagnetic switching valve 155LH, 155RH, 155LL, 155RL connects the hydraulic pump 154 and the press cylinders 150LH, 150RH, 150LL, 150RL in the closing direction of the

press panels

140F, 140B when switched from the neutral a position to the b position. At the same time, when the position is switched to the position c, the

press plates

140F and 140B are connected in the opening direction. In order to drive and control the pressing cylinders 150LH, 150RH, 150LL, and 150RL with high accuracy, the electromagnetic switching valves 155LH, 155RH, 155LL, and 155RL are controlled by, for example, PWM control based on a duty ratio (also commonly referred to as duty control). It is desirable to apply

Between the variable displacement type open / close cylinder hydraulic pump 182 driven by the electric motor 108 and the open / close cylinder 180, a 4-port 3-position switching type electromagnetic switching valve 183 is disposed. The electromagnetic switching valve 183 connects the hydraulic pump 154 and the opening / closing cylinder 180 in the closing direction of the

pressing plates

140F and 140B when the neutral a position is switched to the b position, and also when the switching position is switched to the c position. Connect in the opening direction of 140F and 140B.

As shown in the block diagram of FIG. 7, the control board 20 that is a cylinder control unit of the press control system includes a CPU 21 that is an arithmetic device, a ROM 23 that is a read-only storage device, and a readable / writable main storage device that is a work area. And the input / output interface (I / F) 24. These devices are connected via a bus 25 so as to be able to transmit and receive each other. In the ROM 23,

various control programs

23a, 23b, 23c for executing the press control and inclination calculation for calculating the inclination of the processed plate material W1 at the time of heating and pressing as the inclination of the

pressing plates

140F, 140B (pressing surface 141). In addition to the program 23d, selection tables 23e and 23f for initial setting of the size and material of the processed plate material W1 are stored and stored in advance.

As shown in FIG. 7, the following signals are inputted to the control board 20 from each part of the hot press part 100 via the input / output interface 24.
A size selection switch 10: a switch signal when the size of the plate W1 to be processed is manually selected or input by a push button or the like;
Material selection switch 11: A switch signal when the material (hard material, soft material) of the processed plate material W1 is artificially selected or input by a push button or the like;
-Opening / closing cylinder pressure switch 181: Cylinder internal pressure level detection signal when the

pressing plates

140F, 140B are closed / opened by the opening / closing cylinder 180;
・ Pressure cylinder linear encoders 151LH, 151RH, 151LL, 151RL: detection signals of the movement amounts of the rams 153LH, 153RH, 153LL, 153RL;
Pressing cylinder pressure sensors 152LH, 152RH, 152LL, 152RL: cylinder internal pressure detection signals of the pressing cylinders 150LH, 150RH, 150LL, 150RL.

Similarly, the next signal is output from the control board 20 to each unit of the hot press unit 100 via the input / output interface 24.
・ Pressing cylinders 150LH, 150RH, 150LL, 150RL: Control for pressing and pressing the

pressing plates

140F, 140B (pressing surface 141) and correcting (relaxing) the inclination of the object to be processed W (processing plate material W1). Output signal;
Opening / closing cylinder 180: A control output signal for closing / opening the

press panels

140F and 140B (pressing surface 141) by approaching / separating them.

Next, press control in the hot press unit 100 will be described with reference to the display units 106LH to 107RL in FIG. 5 using the flowcharts in FIGS. FIG. 8 corresponds to the press preparation processing program 23a of FIG. Similarly, FIG. 9 corresponds to the hard material press processing program 23b, and FIG. 10 corresponds to the soft material press processing program 23c.

In the press preparation process shown in FIG. 8, first, in S1, the size selection switch 10 and the material selection switch 11 use the size (6 scale material, 8 scale material, 10 scale material, etc.) and material (hard) of the plate material W1 to be processed. Material, soft material, etc.). Based on the input contents, fine adjustment is performed with reference to the selection tables 23e and 23f (FIG. 7) of the ROM 23. Specifically, in S2, the set value S of the ram movement amount and the target value P of the cylinder internal pressure are finely adjusted according to the size of the plate material W1 to be processed. Next, the material selected in S3 is confirmed. If the material is a hard material (YES in S3), the hard material press process is executed in S4 and the press preparation process is completed. If the material is a soft material, If (NO in S3), the soft material pressing process is executed in S6.

FIG. 9 shows the hard material press processing subroutine (S4) of FIG. When the plate material W1 to be processed is a hard material, each cylinder internal pressure is allowed to reach a predetermined target range P ± ΔP as the

pressing plates

140F and 140B are pressed by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. At that time, if the ram movement amount of each of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is within a predetermined set range S ± ΔS, the inclination calculation program 23d (see FIG. 7) uses the detected value of each ram movement amount. The inclination of the processing plate material W1 is calculated as the inclination of the

pressing plates

140F and 140B (pressing surface 141). If the inclination exceeds a predetermined value, it is considered that an inclination to be corrected (relaxed) occurs in the processed plate material W1, and therefore the upper and lower limit values P + ΔP, P− of the target range P ± ΔP related to the cylinder internal pressure. ΔP is expanded to P + 2ΔP and P-2ΔP, respectively, and the corresponding cylinder internal pressure is increased (or reduced).

Specifically, when a press start switch (not shown) is turned ON (YES in S41), the electromagnetic switching valve 183 is switched to the b position in S42, and the

pressing plates

140F and 140B are driven to close by the opening / closing cylinder 180. The driving is stopped by the detection of the pressure switch 181. After that, in S43, the

pressing plates

140F and 140B are simultaneously pressed by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. In S44, it is confirmed by the pressure sensors 152LH, 152RH, 152LL, and 152RL whether the internal pressures of the pressing cylinders 150LH, 150RH, 150LL, and 150RL have reached the target range P ± ΔP (for example, 7.0 ± 0.2 MPa). To do. If each cylinder internal pressure has reached the target range P ± ΔP as shown in FIG. 5 (YES in S44), each ram movement amount is within the set range S ± ΔS (for example, 1770 ± 20 mm) in S45. Is confirmed by the linear encoders 151LH, 151RH, 151LL, and 151RL. If each ram movement amount is within the set range S ± ΔS as shown in FIG. 5 (YES in S45), the inclination of the

press plates

140F, 140B (pressing surface 141) is determined from the detected value of each ram movement amount in S46. Calculate.

Next, in S47, the magnitude of the slope calculated in S46 is determined. When the inclination exceeds a predetermined value (for example, 5 °) (NO in S47), in S48, the inclination is corrected (relaxed) by judging from the inclination of the

press plates

140F and 140B (pressing surface 141). Further, a pressing cylinder that needs to be pressed (or reversed in some cases) is determined. Further, in S49, when further pressing is performed to correct (relax) the inclination, it is confirmed whether the internal pressure of the pressing cylinder is P + 2ΔP (for example, 7.0 + 0.4 MPa) or less. It is confirmed whether the internal pressure is P-2ΔP (for example, 7.0-0.4 MPa) or more. If the cylinder internal pressure is P + 2ΔP or lower (or P-2ΔP or higher) (YES in S49), the internal pressure of the corresponding pressing cylinder is increased (or decreased) in S50, and the

pressing plates

140F and 140B (pressing surface 141) Is corrected (relaxed), and the process returns to S45.

In FIG. 5, when the amount of ram movement (1750 mm) of the lower row pressing cylinders 150LL and 150RL is relatively small and the inclination is calculated to exceed a predetermined value (NO in S47), the lower row pressing cylinders 150LL, It is determined that 150RL needs to be further pressed (S48). Since the cylinder internal pressure (7.0 MPa) of the pressing cylinders 150LL and 150RL is P + 2ΔP or less (YES in S49), the duty ratio of the electromagnetic switching valves 155LL and 155RL is increased to correct (relax) the inclination, and the pressing cylinders 150LL and 150RL The flow rate to 150RL is increased (S50).

In this way, when the inclination of the

press plates

140F, 140B (pressing surface 141) is corrected (relaxed) to a predetermined value or less, or when the inclination has been equal to or less than the predetermined value from the beginning (YES in S47), the process goes to S52. Then, the pressing drive of all the pressing cylinders 150LH, 150RH, 150LL, 150RL is stopped. Further, in S53, after a predetermined time has elapsed (for example, after 10 seconds), the electromagnetic switching valves 155LH, 155RH, 155LL, 155RL, and 183 are switched to the c position, respectively, and all the pressing cylinders 150LH, 150RH, 150LL, 150RL, and the opening / closing cylinders are switched. The

press plates

140F and 140B are driven to open by 180, and the driving is stopped by the detection of the pressure sensors 152LH, 152RH, 152LL, and 152RL and the pressure switch 181 to end the hard material pressing process. If each ram movement amount is not within the set range S ± ΔS (NO in S45), and the internal pressure of the pressing cylinder that needs to be further pressed (or returned) to correct (relax) the inclination exceeds P + 2ΔP (or If it is less than P-2ΔP (NO in S49), there is a high possibility of a defective product, so an alarm is issued in S51 and the process is interrupted.

欅 In hard materials such as Lauan and hard materials with relatively large elasticity and repulsion, the

press plates

140F and 140B tend to tilt due to the rebound (spring back) phenomenon. Therefore, first, each cylinder internal pressure is made to reach the target range P ± ΔP, and the ram movement amount of each of the pressing cylinders 150LH, 150RH, 150LL, 150RL at that time is within the setting range S ± ΔS, and the

pressing plates

140F, 140B. When the inclination of exceeds the predetermined value, the cylinder internal pressure is further increased to the allowable range P + 2ΔP to correct (relax) the inclination. In this way, the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is individually controlled with emphasis on pressure. In particular, even if the

pressing plates

140F and 140B are inclined due to the return phenomenon in the hard material, the inclination of the

pressing plates

140F and 140B is performed in the process of finishing the entire thickness of the object to be processed W (processed plate material W1 + hot plate 130) to a predetermined allowable dimension. Therefore, the occurrence of defective products can be suppressed and the product yield can be improved.

FIG. 10 shows the soft material press processing subroutine (S6) of FIG. When the processed plate material W1 is a soft material, each ram movement amount is set to the lower limit value S−ΔS of the predetermined setting range S ± ΔS in accordance with the pressing of the

pressing plates

140F, 140B by the pressing cylinders 150LH, 150RH, 150LL, 150RL. To reach. At this time, if each cylinder internal pressure is equal to or less than the upper limit value P + ΔP of the predetermined target range P ± ΔP, the

pressure discs

140F and 140B (pressing force) are detected by the inclination calculation program 23d (see FIG. 7) from the detected value of each ram movement amount. The inclination of the surface 141) is calculated. When the inclination exceeds a predetermined value, it is considered that an inclination to be corrected (relaxed) is generated in the processed plate material W1, so that the ram movement amount of the corresponding pressing cylinder corresponds within the set range S ± ΔS. The cylinder internal pressure is increased within the target range P ± ΔP.

Specifically, when a press start switch (not shown) is turned on (YES in S61), the electromagnetic switching valve 183 is switched to the b position in S62, and the

pressing plates

140F and 140B are driven to be closed by the opening / closing cylinder 180. The driving is stopped by the detection of the pressure switch 181. After that, in S63, the

pressing plates

140F and 140B are simultaneously pressed and driven by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. In S64, the linear encoders 151LH, 151RH, whether the movement amounts of the respective rams 153LH, 153RH, 153LL, 153RL have reached the lower limit value S−ΔS (eg, 1750 mm) of the set range S ± ΔS (eg, 1770 ± 20 mm) Confirm with 151LL and 151RL. As shown in FIG. 5, if each ram movement amount is equal to or greater than the lower limit value S−ΔS (YES in S64), the internal pressure of each pressing cylinder 150LH, 150RH, 150LL, 150RL is set to the target range P ± ΔP (eg, It is confirmed by the pressure sensors 152LH, 152RH, 152LL, and 152RL whether or not the upper limit value P + ΔP (for example, 7.2 MPa) is 7.0 ± 0.2 MPa). If each cylinder internal pressure is equal to or less than the upper limit value P + ΔP as shown in FIG. 5 (YES in S65), the inclination of the

press plates

140F, 140B (press surface 141) is calculated from the detected value of each ram movement amount in S66.

Next, the magnitude of the slope calculated in S66 is determined in S67. If the inclination exceeds a predetermined value (for example, 5 °) (NO in S67), in S68, the inclination is corrected (relaxed) by judging from the inclination of the

press plates

140F and 140B (pressing surface 141). Further, a pressing cylinder that needs to be pressed is determined. Further, in S69, it is confirmed whether the ram movement amount of the pressing cylinder that is further pressed to correct (relax) the inclination is equal to or less than the upper limit value S + ΔS (for example, 1790 mm) of the setting range S ± ΔS. If the amount of ram movement is less than or equal to the upper limit value S + ΔS (YES in S69), the internal pressure of the corresponding pressing cylinder is increased in S70, and the inclination of the

pressing plates

140F, 140B (pressing surface 141) is corrected (relaxed). , Return to S65.

In FIG. 5, when the ram movement amount (1750 mm) of the lower row pressing cylinders 150LL and 150RL is relatively small and the inclination is calculated to exceed a predetermined value (NO in S67), the lower row pressing cylinders 150LL, It is determined that 150RL needs to be further pressed (S68). Since the ram movement amount (1750 mm) of the pressing cylinders 150LL and 150RL is equal to or less than the upper limit value S + ΔS (YES in S69), the duty ratio of the electromagnetic switching valves 155LL and 155RL is increased to correct (relax) the inclination, and the pressing cylinder 150LL , 150RL is increased (S70).

In this way, when the inclination of the

pressing plates

140F and 140B (pressing surface 141) is corrected (relaxed) to a predetermined value or less, or when the inclination has been a predetermined value or less from the beginning (YES in S67), the process proceeds to S72. Then, the pressing drive of all the pressing cylinders 150LH, 150RH, 150LL, 150RL is stopped. Further, in S73, after a predetermined time elapses (for example, after 10 seconds), the electromagnetic switching valves 155LH, 155RH, 155LL, 155RL, and 183 are respectively switched to the c position, and all the pressing cylinders 150LH, 150RH, 150LL, 150RL and the opening / closing cylinder 180 are switched. Thus, the

pressing plates

140F and 140B are driven to open, and the driving is stopped by the detection of the pressure sensors 152LH, 152RH, 152LL, and 152RL and the pressure switch 181 to finish the soft material pressing process. When each cylinder internal pressure exceeds the upper limit value P + ΔP (NO in S65), and when the ram movement amount of the pressing cylinder that needs to be further pressed to correct (relax) the inclination exceeds the upper limit value S + ΔS ( Since there is a high possibility of being a defective product at NO in S69, an alarm is issued in S71 and the process is interrupted.

Soft materials such as cedar and paulownia that are soft and have a relatively low elasticity and repulsive force can easily be reduced in thickness by pressing, and the thickness after thermocompression bonding can be achieved even if the cylinder pressure is within the target range P ± ΔP. Tends to be thinner than specified (particularly at the cylinder pressing position). Therefore, first, each ram movement amount is made to reach the lower limit value S−ΔS of the set range S ± ΔS, and the cylinder internal pressures of the respective press cylinders 150LH, 150RH, 150LL, 150RL at that time are lower than the upper limit value P + ΔP, When the inclinations of 140F and 140B exceed a predetermined value, the ram movement amount is further increased to the upper limit value S + ΔS to correct (relax) the inclination. In this way, the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is individually controlled with emphasis on distance. In particular, in the process of finishing the entire thickness of the object to be processed W (processed plate material W1 + hot plate 130) to a predetermined allowable size while preventing (monitoring) the occurrence of excessive pressing on the soft material, the

press plates

140F and 140B Since the inclination can be corrected (relaxed), the generation of defective products can be suppressed and the product yield can be improved.

As described above, even when the size and material of the processed plate material W1 are changed, the thickness of the processed plate material W2 is kept within the allowable range by individually controlling the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL. Will be able to hold. Therefore, the pressing cylinders 150LH, 150RH, 150LL, and 150RL, which are sturdy and heavy structures, do not have to be provided with a pressing position movement adjusting mechanism for moving and adjusting the pressing position. Manufacturing costs required for installation and running costs required for operation and repair can be reduced.

Further, since the cylinder internal pressure and the ram movement amount are detected and controlled for each of the pressing cylinders 150LH, 150RH, 150LL, and 150RL, the detection values (cylinder internal pressure and ram movement amount) obtained from the pressing cylinders 150LH, 150RH, 150LL, and 150RL are controlled. ) Can immediately control the operation of each pressing cylinder 150LH, 150RH, 150LL, 150RL, and simplification and speeding up of the control can be achieved. Furthermore, since the entire thickness of the object to be processed W (processed plate material W2 + hot plate 130) is detected not by the individual thicknesses of the processed plate material W2 but by the amount of ram movement, the time required for detection can also be reduced. Therefore, due to the delay in control, the inclination of the

press plates

140F and 140B occurs, resulting in uneven thickness of the processed plate material W2, or the stop of the press cylinders 150LH, 150RH, 150LL, and 150RL is delayed and out of specification. The thickness can be prevented.

In addition to the pressing cylinders 150LH, 150RH, 150LL, and 150RL, an opening / closing cylinder 180 dedicated to opening and closing the

pressing plates

140F and 140B is provided, so that the opening / closing cylinder 180 that requires high-speed movement over a long span and fine movement over a short span The pressing cylinders 150LH, 150RH, 150LL, and 150RL that require a large number can be used properly. Therefore, the work efficiency of the hot press is improved by accelerating the opening / closing operation of the

pressing plates

140F, 140B, and the drive control of the pressing cylinders 150LH, 150RH, 150LL, 150RL is not affected by the opening / closing operation of the

pressing plates

140F, 140B. Can be done with high accuracy.

(Modification 1-1)
FIG. 11 is a hydraulic circuit diagram showing a modification of FIG. In the pressing cylinder shown in FIG. 11, a control valve (servo valve) for controlling the flow rate or pressure based on the input signal and a follow-up mechanism for feedback control of the final control position (drive distance = ram movement amount) are integrated. Servo cylinders 150LH ′, 150RH ′, 150LL ′, 150RL ′, which are servo actuators, are used. As described above, the servo cylinders 150LH ′, 150RH ′, 150LL ′, and 150RL ′ are combined and integrated with the servo valve (or it can be seen that the servo valve is incorporated). 6 electromagnetic switching valves 155LH, 150RH, 150LL, and 155RL are not required, and the hydraulic circuit can be simplified. Since the servo valve has a function of controlling the total flow rate and the flow velocity at the same time, the ram movement amount and ram movement of the pressing cylinders 150LH ′, 150RH ′, 150LL ′, 150RL ′ when the workpiece W is heated and pressed. The speed can be adjusted in combination, and more precise control is possible.

(Modification 1-2)
FIG. 12 is a flowchart showing a modification of FIG. In the hard material press processing subroutine (S4) shown in FIG. 12, as an index for determining whether or not the ram movement amount (drive distance) of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is within a uniform range, FIG. Instead of the inclination of the

press plates

140F and 140B (pressing surface 141) calculated in S46 (that is, the inclination of the processed plate material W1), the linear encoders 151LH, 151RH, 151LL, and 151RL (movement amount detection means; distance detection means) are detected. In addition, the difference (S46 ′) in each ram movement amount is used. Therefore, in this modification, the inclination calculation program 23d shown in FIG. 7 can be omitted to simplify the control.

Specifically, when determining the difference between the ram movement amounts in S47 ′ of FIG. 12, the ram movement amount difference (maximum allowable width; for example, 20 mm) used for the determination is the ram movement amount setting range S ±. It is set to be smaller (for example, 1/2) than the width (maximum allowable width; for example, 40 mm = ± 20 mm) of ΔS (for example, 1770 ± 20 mm). In FIG. 5, the width (25 mm) between the ram movement amount (1750 mm) of the lower row pressing cylinders 150LL and 150RL and the ram movement amount (1775 mm) of the upper right pressing cylinder 150RH exceeds the maximum allowable width (20 mm) (S47). 'No'). Therefore, it is determined that it is necessary to further press the pressing cylinders 150LL and 150RL in the lower row (S48 ').

(Modification 1-3)
FIG. 13 is a flowchart showing a modification of FIG. In the soft material press processing subroutine (S6) shown in FIG. 13, as an index for determining whether or not the ram movement amount (drive distance) of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is within a uniform range, FIG. Instead of the inclination of the

press plates

140F and 140B (pressing surface 141) calculated in S66 (that is, the inclination of the processed plate material W1), the linear encoders 151LH, 151RH, 151LL, and 151RL (movement amount detection means; distance detection means) are detected. Further, the difference (S66 ′) between the ram movement amounts is used. Therefore, also in this modified example, the inclination calculation program 23d shown in FIG. 7 can be omitted to simplify the control.

Specifically, when determining the difference between the ram movement amounts in S67 ′ of FIG. 13, the ram movement amount difference (maximum allowable width; eg, 20 mm) used for the determination is the ram movement amount setting range S ±. It is set to be smaller (for example, 1/2) than the width (maximum allowable width; for example, 40 mm = ± 20 mm) of ΔS (for example, 1770 ± 20 mm). In FIG. 5, the width (25 mm) between the ram movement amount (1750 mm) of the lower row pressing cylinders 150LL and 150RL and the ram movement amount (1775 mm) of the upper right pressing cylinder 150RH exceeds the maximum allowable width (20 mm) (S67). 'No'). Therefore, it is determined that it is necessary to further press the pressing cylinders 150LL and 150RL in the lower row (S68 ').

(Example 2)
FIG. 14 is a front view showing another example of the arrangement relationship of the press control system, FIG. 15 is a hydraulic circuit diagram thereof, and FIG. 16 is a block diagram showing its electrical configuration. In the hot press section 100 (heating and pressing section; press structure) shown in the layout diagram of FIG. 14, the lower row pressing cylinders 150LL and 150RL (hydraulic cylinders; fluid pressure cylinders) correspond to the pressing surfaces 141 of the

pressing plates

140F and 140B. It constitutes a fixed pressing cylinder whose pressing position is unchanged. On the other hand, the upper rows of pressing cylinders 150LH and 150RH (hydraulic cylinders; fluid pressure cylinders) constitute a movable pressing cylinder in which the pressing position with respect to the pressing surface 141 can be changed in the vertical direction. In addition, lift cylinders 170LH and 170RH (hydraulic cylinders; fluid pressure cylinders) are provided as pressing position movement adjusting mechanisms for the upper-row pressing cylinders 150LH and 150RH. Further, the elevating cylinders 170LH and 170RH are provided with elevating cylinder photoelectric sensors 171LH and 171RH (movement detecting means) for detecting the ascending / descending positions of the pressing cylinders 150LH and 150RH.

As shown in the hydraulic circuit diagram of FIG. 15, there is a four-port, three-position switching type electromagnetic switching between a variable displacement type lifting cylinder hydraulic pump 172 driven by the electric motor 108 and each lifting cylinder 170LH, 170RH. A valve 173 is arranged. When the electromagnetic switching valve 173 is switched from the neutral a position to the b position, the hydraulic pump 172 and the lifting cylinders 170LH and 170RH are connected in the ascending direction of the pressing cylinders 150LH and 150RH, and are switched to the c position. Similarly, connect in the downward direction.

As shown in the block diagram of FIG. 16, a control output signal for raising and lowering the pressing cylinders 150LH and 150RH in accordance with the input of the size selection switch 10 is sent to the control board 20 (cylinder) via the input / output interface 24. From the control unit) to the lifting cylinders 170LH and 170RH. On the other hand, the position detection signals of the photoelectric sensors 171LH and 171RH are input to the control board 20 via the input / output interface 24 as the pressing cylinders 150LH and 150RH are raised and lowered by the lifting cylinders 170LH and 170RH.

Therefore, the flowchart of the press preparation process described in the first embodiment (FIG. 8) is changed as shown in FIG. 17 in the present embodiment.

In the press preparation processing shown in FIG. 17, first, the size (6 scale material, 8 scale material, 10 scale material, etc.) and material (hard) of the plate material W1 to be processed are selected by the size selection switch 10 and the material selection switch 11 in S1. Material, soft material, etc.). Based on the input content, in S102, the electromagnetic switching valve 173 is switched to the b position or the c position in accordance with the size of the processed plate material W1, and the elevating cylinders 170LH and 170RH are driven up or down, and the photoelectric sensors 171LH, The raising / lowering drive is stopped by detection of 171RH. Next, the material selected in S3 is confirmed. If the material is a hard material (YES in S3), the hard material press process is executed in S4 and the press preparation process is completed. If the material is a soft material, If (NO in S3), the soft material pressing process is executed in S6.

In this embodiment, the upper row pressing cylinders 150LH and 150RH are movable pressing cylinders capable of changing the pressing position. Therefore, even if the height position of the upper side of the processed plate material W1 changes when the size of the processed plate material W1 changes, the processed plate material W1 is adjusted by adjusting the pressing positions of the upper rows of pressing cylinders 150LH and 150RH. It is possible to suppress the occurrence of tilt.

(Modification 2)
FIG. 18 is a hydraulic circuit diagram showing a modification of FIG. As in the modified example 1-1 (FIG. 11), servo cylinders 150LH ′, 150RH ′, 150LL ′, 150RL ′ are also used in the pressing cylinder shown in FIG. Therefore, also in this modified example, the hydraulic circuit can be simplified and precisely controlled.

(Example 3)
FIG. 19 is a front view showing still another example of the arrangement relationship of the press control system, FIG. 20 is a hydraulic circuit diagram thereof, and FIG. 21 is a block diagram showing its electrical configuration. In the hot press unit 100 (heating and pressing unit; press structure) shown in the layout diagram of FIG. 19, in addition to the upper row pressing cylinders 150LH and 150RH (hydraulic cylinder; fluid pressure cylinder), the lower row pressing cylinders 150LL and 150RL. (Hydraulic cylinder; fluid pressure cylinder) also constitutes a movable pressing cylinder in which the pressing position of the

pressing plates

140F and 140B with respect to the pressing surface 141 can be changed in the vertical direction. Along with this, elevating cylinders 170LL and 170RL (hydraulic cylinders; fluid pressure cylinders) are added as pressing position movement adjusting mechanisms for the pressing cylinders 150LL and 150RL in the lower row. The elevating cylinders 170LL and 170RL include elevating cylinder photoelectric sensors 171LL and 171RL (movement detecting means) for detecting the ascending / descending positions of the pressing cylinders 150LL and 150RL.

As shown in the hydraulic circuit diagram of FIG. 20, the electromagnetic switching valve 173 is also disposed between the lift cylinder hydraulic pump 172 and the lift cylinders 170LL and 170RL. Therefore, when the electromagnetic switching valve 173 is switched from the neutral a position to the b position, the hydraulic pump 172 and the lifting cylinders 170LL and 170RL are connected in the ascending direction of the pressing cylinders 150LL and 150RL and are switched to the c position. Similarly, connect in the downward direction.

As shown in the block diagram of FIG. 21, a control output signal for raising and lowering the pressing cylinders 150LL and 150RL in accordance with the input of the size selection switch 10 is sent to the control board 20 (cylinder) via the input / output interface 24. From the control unit) to the lifting cylinders 170LL and 170RL. On the other hand, the position detection signals of the photoelectric sensors 171LL and 171RL are input to the control board 20 via the input / output interface 24 as the pressing cylinders 150LL and 150RL are raised and lowered by the lifting cylinders 170LL and 170RL.

(Modification 3)
FIG. 22 is a hydraulic circuit diagram showing a modification of FIG. As in the modified example 1-1 (FIG. 11), servo cylinders 150LH ′, 150RH ′, 150LL ′, 150RL ′ are also used in the pressing cylinder shown in FIG. Therefore, also in this modified example, the hydraulic circuit can be simplified and precisely controlled.

Example 4
FIG. 23 is a front view showing still another example of the arrangement relationship of the press control system, FIG. 24 is a hydraulic circuit diagram thereof, and FIG. 25 is a block diagram showing its electrical configuration. In the hot press section 100 (heat pressurizing section; press structure) shown in the layout diagram of FIG. 23, there are two pressing cylinders, and the two

pressing cylinders

150L and 150R (hydraulic cylinders; fluid pressure cylinders) are transported. The separation distance from the reference plane B is substantially the same as that of the opening / closing cylinder 180 (hydraulic cylinder; fluid pressure cylinder), and they are arranged on the left and right sides of the opening / closing cylinder 180.

Each of the

pressing cylinders

150L and 150R includes pressing cylinder

linear encoders

151L and 151R (movement amount detection means; distance detection means) that detect a reduction amount of the entire thickness of the workpiece W as a ram movement amount (drive distance); Pressure

cylinder pressure sensors

152L and 152R (pressure detection means) for detecting the pressures of the

pressure plates

140F and 140B as cylinder internal pressures (drive pressures) of the

pressure cylinders

150L and 150R are provided. Elevating

cylinders

170L and 170R (hydraulic cylinders; fluid pressure cylinders) are provided as a mechanism for adjusting the pressing position of the

pressing cylinders

150L and 150R. The elevating

cylinders

170L and 170R include elevating cylinder

photoelectric sensors

171L and 171R (movement detecting means) for detecting the ascending / descending positions of the

pressing cylinders

150L and 150R.

As shown in the hydraulic circuit diagram of FIG. 24, a four-port, three-position switching electromagnetic switch is provided between the variable displacement type press cylinder hydraulic pump 154 driven by the electric motor 108 and the

press cylinders

150L and 150R.

Valves

155L and 155R are respectively disposed. When the

electromagnetic switching valves

155L and 155R are switched from the neutral a position to the b position, the hydraulic pump 154 and the

pressing cylinders

150L and 150R are connected in the closing direction of the

pressing plates

140F and 140B and are switched to the c position. In the same way, the

press plates

140F and 140B are connected in the opening direction. In order to drive and control the

press cylinders

150L and 150R with high accuracy, it is desirable to apply, for example, PWM control based on a duty ratio (also commonly referred to as duty control) to these

electromagnetic switching valves

155L and 155R. .

Between the variable displacement type lift cylinder hydraulic pump 172 driven by the electric motor 108 and the

lift cylinders

170L, 170R, a four-port three-position switching type electromagnetic switching valve 173 is disposed. When the electromagnetic switching valve 173 is switched from the neutral a position to the b position, the hydraulic pump 172 and the lifting

cylinders

170L and 170R are connected in the ascending direction of the

pressing cylinders

150L and 150R, and are switched to the c position. Similarly, connect in the downward direction.

As described above, the

pressing cylinders

150L and 150R are configured with two movable (elevating and lowering) types in which the pressing positions of the

pressing plates

140F and 140B with respect to the pressing surface 141 can be changed in the vertical direction, thereby configuring the hot press unit 100. Can be further simplified. The block diagram of FIG. 25 is configured based on the changes in FIGS. 23 and 24. The difference from the block diagrams (FIGS. 7, 16, and 21) shown in the first to third embodiments is the same as the block diagram of FIGS. Since it is apparent at first glance from the above description, the description of FIG. 25 is omitted.

(Modification 4)
FIG. 26 is a hydraulic circuit diagram showing a modification of FIG. As in the modified example 1-1 (FIG. 11), servo cylinders 150L ′ and 150R ′ are also used in the pressing cylinder shown in FIG. Therefore, also in this modified example, the hydraulic circuit can be simplified and precisely controlled.

(Example 5)
FIG. 27 is a hydraulic circuit diagram showing still another example of the press control system, and FIG. 28 is a block diagram showing its electrical configuration. In the press control system shown in this embodiment, a method of controlling the driving of a plurality of (for example, four) pressing cylinders collectively (individually) instead of individually (individually individually) is adopted. This is the same as Example 1 (FIG. 5).

However, in the hydraulic circuit diagram of FIG. 27, unlike the first embodiment (FIG. 6), the variable displacement type press cylinder hydraulic pump 154 driven by the electric motor 108 and the press cylinders 150LH, 150RH, 150LL, 150RL (hydraulic pressure) A single electromagnetic switching valve 155 of a four-port three-position switching type is disposed between the cylinder and the fluid pressure cylinder). The electromagnetic switching valve 155 connects the hydraulic pump 154 and the pressing cylinders 150LH, 150RH, 150LL, and 150RL simultaneously in the closing direction of the

pressing plates

140F and 140B when switched from the neutral a position to the b position, and is also in the c position. When switched, the

press plates

140F and 140B are connected in the opening direction. In the block diagram of FIG. 28, unlike the first embodiment (FIG. 7), the inclination calculation program is omitted in the ROM 23 of the control board 20 (cylinder control unit).

Therefore, in this embodiment, the hard material press processing subroutine (S4) executed after the press preparation processing (see FIG. 8) is expressed as shown in FIG. 29, and the soft material press processing subroutine (S6) is shown in FIG. It is expressed as

FIG. 29 shows a hard material press processing subroutine (S4) in place of FIG. When the processed plate material W1 is a hard material, each cylinder internal pressure is allowed to reach the target range P ± ΔP in accordance with the pressing of the

pressing plates

140F and 140B by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. If any of the ram movement amounts detected at that time falls below S−ΔS, which is the lower limit value of the predetermined set range S ± ΔS, the processed plate material W1 (that is, the

pressing plates

140F and 140B (the pressing surface) 141)) is likely to be tilted. Therefore, in order to correct (relax) the inclination, the cylinder internal pressure of each of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is increased and added within an allowable range (for example, P + 2ΔP) set higher than the target range P ± ΔP. Press drive.

Specifically, based on the set value S of the ram movement amount finely adjusted according to the size of the plate material W1 and the target value P of the cylinder internal pressure (see S2 in FIG. 8), the ram movement amount in S40. Set range S ± ΔS (for example, 1770 ± 15 mm) and a target range P ± ΔP (for example, 7.0 ± 0.2 MPa) of the cylinder internal pressure are determined. When a press start switch (not shown) is turned on (YES in S41), the electromagnetic switching valve 183 is switched to the b position in S42, and the

pressing plates

140F and 140B are driven to close by the opening / closing cylinder 180, and the pressure switch 181 The drive is stopped by detecting this. After that, in S43, the

pressing plates

140F and 140B are simultaneously pressed and driven by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. In S144, the pressure sensors 152LH, 152RH, 152LL, and 152RL indicate whether the internal pressure of each of the pressing cylinders 150LH, 150RH, 150LL, and 150RL has reached the target range P ± ΔP (here, 7.0 ± 0.2 MPa). Check.

If each cylinder internal pressure has reached the target range P ± ΔP as shown in FIG. 5 (YES in S144), each ram movement amount is within the set range S ± ΔS (here, 1770 ± 15 mm) in S145. It is confirmed by the linear encoders 151LH, 151RH, 151LL, 151RL whether or not it has been reached. As shown in FIG. 5, when the ram movement amount of the pressing cylinders 150LL and 150RL in the lower row is out of the setting range S ± ΔS (NO in S145), one of the ram movement amounts is then set in the setting range S in S146. It is confirmed whether it is below S−ΔS (here, 1755 mm), which is the lower limit of ± ΔS. In FIG. 5, when the amount of ram movement of the lower row pressing cylinders 150LL and 150RL is less than the lower limit value S−ΔS (YES in S146), the processed plate material W1 (that is, the

pressing plates

140F and 140B (the pressing surface 141)). Is likely to be inclined, and the processed plate material W1 has a margin for the pressing process. Therefore, in order to correct (relax) the inclination, the target range of the cylinder internal pressure is changed (increased) to P + 2ΔP (here, 7.4 MPa) in S147, and the process returns to S43 and the simultaneous pressing drive is continued.

In this way, when each ram movement amount is within the set range S ± ΔS due to continued pressing drive, or when it is within the set range from the beginning (YES in S145), the inclination is corrected (relaxed). Alternatively, it is determined that there is no inclination, and the pressing drive of all the pressing cylinders 150LH, 150RH, 150LL, 150RL is stopped in S52. Further, in S53, after a predetermined time elapses (for example, after 10 seconds), the

electromagnetic switching valves

155 and 183 are switched to the c position, and the

pressing plates

140F and 140B are moved by the all pressing cylinders 150LH, 150RH, 150LL, 150RL and the opening / closing cylinder 180. The drive is opened, the drive is stopped by the detection of the pressure switch 181, and the hard material pressing process is terminated. If any of the ram movement amounts exceeds the upper limit value S + ΔS (NO in S146), there is a high possibility of a defective product, so an alarm is issued in S148 and the process is interrupted.

press plates

140F and 140B tend to tilt due to the rebound (spring back) phenomenon. Therefore, first, the internal pressure of each cylinder is made to reach the target range P ± ΔP, and the presence / absence of the inclination of the

press plates

140F and 140B and the propriety of the press drive (pressure increase) are determined (estimated) from the ram movement amount at that time. To do. If it is determined that “inclination exists” and “pressure increase is possible”, the cylinder internal pressure is further increased within the allowable range P + 2ΔP to correct (relax) the inclination. In this way, the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is collectively controlled with emphasis on pressure. In particular, even if the

pressing plates

FIG. 30 shows a soft material press processing subroutine (S6) instead of FIG. When the processed plate material W1 is a soft material, each ram movement amount is set to the lower limit value S−ΔS of the predetermined setting range S ± ΔS in accordance with the pressing of the

pressing plates

140F, 140B by the pressing cylinders 150LH, 150RH, 150LL, 150RL. To reach. At that time, if there is one in which each cylinder internal pressure falls below P−ΔP, which is the lower limit value of the predetermined target range P ± ΔP, the processed plate material W1 (ie, the

press plates

140F and 140B (pressing surface 141)) is inclined. May have occurred. Therefore, in order to correct (relax) the inclination, the ram movement amount is additionally pressed within the set range S ± ΔS.

Specifically, based on the set value S of the ram movement amount finely adjusted according to the size of the plate material W1 and the target value P of the cylinder internal pressure (see S2 in FIG. 8), the ram movement amount in S60. Set range S ± ΔS (for example, 1770 ± 20 mm) and a target range P ± ΔP (for example, 7.5 ± 0.2 MPa) of the cylinder internal pressure are determined. When a press start switch (not shown) is turned ON (YES in S61), the electromagnetic switching valve 183 is switched to the b position in S62, and the

pressure discs

140F and 140B are driven to close by the open / close cylinder 180, and the pressure switch 181 The drive is stopped by detecting this. After that, in S63, the

pressing plates

140F and 140B are simultaneously pressed and driven by the pressing cylinders 150LH, 150RH, 150LL, and 150RL. In S164, the linear encoders 151LH, 151RH, 151LL, and 151RL confirm whether the movement amount of each of the rams 153LH, 153RH, 153LL, and 153RL has reached the lower limit value S−ΔS (here, 1750 mm) of the setting range S ± ΔS. To do.

If each ram movement amount has reached the lower limit value S-ΔS of the setting range S ± ΔS as shown in FIG. 5 (YES in S164), each ram movement amount is set in the setting range S ± ΔS (here, 1770 ± 20 mm) is reconfirmed. If each ram movement amount is within the set range S ± ΔS as shown in FIG. 5 (YES in S165), each cylinder internal pressure is within the target range P ± ΔP (here, 7.5 ± 0.2 MPa) in S166. Is confirmed by the pressure sensors 152LH, 152RH, 152LL, and 152RL. If all the cylinder internal pressures are outside the target range P ± ΔP as shown in FIG. 5 (NO in S166), then, in S167, any one of the cylinder internal pressures becomes the lower limit value P−ΔP of the target range P ± ΔP ( Here, it is confirmed whether it is less than 7.3 MPa). In FIG. 5, when the amount of ram movement of the pressing cylinders 150LL and 150RL in the lower row is equal to the lower limit value S-ΔS (YES in S164) and all the cylinder internal pressures are less than the lower limit value S-ΔS (YES in S167). The plate material W1 to be processed (that is, the

pressing plates

140F and 140B (pressing surface 141)) is highly likely to be inclined, and the plate material W1 to be processed has a margin for the pressing process. Therefore, in order to correct (relax) the inclination, the process returns to S63 and the simultaneous pressing drive is continued.

Thus, when each ram movement amount is within the set range S ± ΔS (YES in S165), when each cylinder internal pressure is within the target range P ± ΔP (YES in S166), the inclination is corrected (YES in S166). In step S72, the pressing operation of all the pressing cylinders 150LH, 150RH, 150LL, and 150RL is stopped. Further, in S73, after a predetermined time has elapsed (for example, after 10 seconds), the

electromagnetic switching valves

155 and 183 are switched to the c position, and the

pressing plates

140F and 140B are moved by all the pressing cylinders 150LH, 150RH, 150LL, 150RL and the opening / closing cylinder 180. The drive is opened, the drive is stopped by the detection of the pressure switch 181, and the soft material pressing process is terminated. If any of the ram movement amounts exceeds the upper limit value S + ΔS (NO in S165), and if any of the cylinder internal pressures exceeds the upper limit value P + ΔP (NO in S167), it becomes a defective product. Since the possibility is great, an alarm is issued in S168 and the process is interrupted.

For soft materials such as cedar and paulownia, which are soft and have relatively little elasticity and repulsive force, the thickness is easily reduced by pressing, and if the cylinder pressure exceeds the target range P ± ΔP, the thickness after thermocompression bonding Tends to be thinner than specified (particularly at the cylinder pressing position). Therefore, first, each ram movement amount is made to reach the lower limit value S−ΔS of the setting range S ± ΔS, and from each cylinder internal pressure at that time, it is determined whether or not the

pressing disks

140F and 140B are inclined and whether or not the pressing drive can be continued ( Infer. If it is determined that “there is inclination” and “continue is possible”, the ram movement amount is further within the set range S ± ΔS, and the pressing drive is continued to correct (relax) the inclination. In this manner, the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL is collectively controlled with an emphasis on distance. In particular, in the process of finishing the entire thickness of the object to be processed W (processed plate material W1 + hot plate 130) to a predetermined allowable size while preventing (monitoring) the occurrence of excessive pressing on the soft material, the

press plates

As described above, in this embodiment, since the operations of the individual pressing cylinders 150LH, 150RH, 150LL, and 150RL are not controlled independently (collectively controlled), the overall configuration of the press control system is the first embodiment (FIG. 5). (FIG. 10) is further simplified. In addition, even if the processed plate material W1 (that is, the

pressing plates

140F and 140B (the pressing surface 141)) is inclined during the heating and pressing, the pressing is performed by controlling at least one of the ram moving amount and the cylinder internal pressure. The inclination can be eliminated in the course of collectively controlling the driving of the cylinders 150LH, 150RH, 150LL, and 150RL.

(Modification 5)
FIG. 31 is a hydraulic circuit diagram showing a modification of FIG. The electric motor shown in FIG. 31 is connected and driven with a follow-up mechanism (servo mechanism) that feedback-controls the final control position (drive distance = ram movement amount) by controlling the rotation direction and rotation speed based on the input signal. Servo motor 108 'is used. Further, the servo motor 108 ′ is provided with a rotary encoder 156 for detecting the rotation direction and the rotation speed. Thus, since the servo mechanism is driven by the servo motor 108 ', the electromagnetic switching valve 155 and the linear encoders 151LH, 151RH, 151LL, 151RL of FIG. 27 are not required in FIG. 31, and the hydraulic circuit can be simplified. . Since the servo motor 108 'has a function of controlling the rotation speed (flow velocity), the ram movement amount and the ram of the pressing cylinders 150LH', 150RH ', 150LL', 150RL 'when the workpiece W is heated and pressed. The moving speed can be adjusted in combination, and more precise control is possible.

(Example 6)
FIG. 32 is a hydraulic circuit diagram showing still another example of the press control system, and FIG. 33 is a block diagram showing its electrical configuration. In the press control system shown in this embodiment, a method of controlling the driving of a plurality of (for example, four) pressing cylinders collectively (individually) instead of individually (individually individually) is adopted. This is the same as Example 2 (FIG. 14).

However, in the hydraulic circuit diagram of FIG. 32, unlike the second embodiment (FIG. 15), the variable displacement type press cylinder hydraulic pump 154 driven by the electric motor 108 and the press cylinders 150LH, 150RH, 150LL, 150RL (hydraulic pressure) A single electromagnetic switching valve 155 of a four-port three-position switching type is disposed between the cylinder and the fluid pressure cylinder). The electromagnetic switching valve 155 connects the hydraulic pump 154 and the pressing cylinders 150LH, 150RH, 150LL, and 150RL simultaneously in the closing direction of the

pressing plates

press plates

140F and 140B are connected in the opening direction. In the block diagram of FIG. 33, unlike the second embodiment (FIG. 16), the tilt calculation program is omitted in the ROM 23 of the control board 20 (cylinder control unit).

Therefore, in this embodiment, the hard material press processing subroutine (S4) executed after the press preparation processing (see FIG. 17) is expressed as shown in FIG. 29, and the soft material press processing subroutine (S6) is shown in FIG. It is expressed as

As described above, in this embodiment, since the operations of the individual pressing cylinders 150LH, 150RH, 150LL, and 150RL are not controlled independently (collectively controlled), the overall configuration of the press control system is the second embodiment (FIG. 14). (FIG. 17) is further simplified. Similarly to the fifth embodiment (FIGS. 27 to 30), even if the processed plate material W1 (that is, the

pressing plates

140F and 140B (pressing surface 141)) is inclined during the heating and pressing, the ram movement amount By controlling at least one of the cylinder internal pressures, the inclination can be eliminated in the course of collectively controlling the driving of the pressing cylinders 150LH, 150RH, 150LL, and 150RL.

(Modification 6)
FIG. 34 is a hydraulic circuit diagram showing a modification of FIG. As in the fifth modification (FIG. 31), the electric motor shown in FIG. 34 also uses a servo motor 108 ′ and includes a rotary encoder 156. Therefore, also in this modified example, the hydraulic circuit can be simplified and precisely controlled.

1 Horizontal multi-stage press device 10 Size selection switch 11 Material selection switch 20 Control board (cylinder control unit)
100 Hot press section (heating and pressing section; press structure)
103F, 103B Fixed frame 130

Hot plate

140F, 140B Press panel 141 Press surface 150LH, 150RH, 150LL, 150RL Press cylinder (hydraulic cylinder; fluid pressure cylinder)
151LH, 151RH, 151LL, 151RL Linear encoder for pressing cylinder (movement amount detection means; distance detection means)
152LH, 152RH, 152LL, 152RL Pressure sensor for pressure cylinder (pressure detection means)
153LH, 153RH, 153LL, 153RL Ram 170LH, 170RH, 170LL, 170RL Lifting cylinder (hydraulic cylinder; fluid pressure cylinder)
171LH, 171RH, 171LL, 171RL Elevating cylinder photoelectric sensor (movement detection means)
180 Opening and closing cylinder (hydraulic cylinder; fluid pressure cylinder)
181 Pressure switch for open / close cylinder (pressure detection means)
B Transport reference plane P Target value of cylinder internal pressure (drive pressure) S Set value of ram travel (drive distance) W Object to be processed W1 Plate material to be processed (plate material)
W2 processed board (laminated plywood)

Claims

A plate is formed by applying adhesives to the bonding surface of a single plate and carrying it in an upright state between a plurality of hot plates and stacking them in the thickness direction. In the horizontal multi-stage press device that presses and presses the plate material by pressing from the outside in the overlapping direction of the body, and collectively manufactures a plurality of wooden laminated plywoods,
A plurality of pressing cylinders arranged at a plurality of positions different from each other with respect to the plate surface of the plate material, and pressing the object to be processed from the overlapping direction;
A cylinder controller that individually controls the driving of each of the plurality of pressing cylinders;
A horizontal multi-stage press device comprising:
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. Combining them together constitutes the object to be processed, and by driving at least one of the pressing plates disposed on both outer sides of the object to be processed in the overlapping direction, the plate material is thermocompression-bonded, and a plurality of wooden laminated plywoods are bundled together. In the horizontal multi-stage press machine manufactured by
An opening / closing cylinder that is disposed near the center on the pressing surface of the pressing plate, and closes / opens the pressing plate by approaching / separating it,
A plurality of pressing cylinders which are arranged at a plurality of positions different from each other with respect to the pressing surface of the pressing plate so as to surround the opening / closing cylinder, and drive the pressing plate to press the objects to be processed from the overlapping direction. When,
A cylinder controller that individually controls the driving of each of the plurality of pressing cylinders;
A horizontal multi-stage press device comprising:
The cylinder control unit includes a distance detection unit that detects driving distances when the plurality of pressing cylinders press the workpiece, and a pressure detection unit that detects driving pressures applied to the plurality of pressing cylinders, respectively. And the driving distance of each pressing cylinder detected by the distance detecting means is not biased within a predetermined setting range in order to keep the thickness of the entire object to be processed after heating and pressing within the allowable dimension range. The horizontal multi-stage press device according to claim 1 or 2, wherein each pressing cylinder is individually driven and controlled so as to approach uniformly.
The cylinder controller
When the driving pressure of each pressing cylinder reaches a predetermined target range in accordance with the pressing drive of the plurality of pressing cylinders, the driving distance of each pressing cylinder detected by the distance detecting means is within the set range; and 4. The horizontal multi-stage press device according to claim 3, wherein the pressing drive of the plurality of pressing cylinders is stopped when it is within a uniform range that can be regarded as uniform without bias.
Whether or not the driving distance of the pressing cylinder is within the uniform range is calculated based on the difference between the driving distances of the pressing cylinders detected by the distance detecting unit or the detected value of the driving distance. The horizontal multi-stage press apparatus according to claim 4, wherein the horizontal multi-stage press apparatus is determined based on the inclination of the plate material.
The cylinder controller
When the driving pressure of each pressing cylinder reaches a predetermined target range in accordance with the pressing drive of the plurality of pressing cylinders, the driving distance of each pressing cylinder detected by the distance detecting means is within the set range; and When it is within a uniform range that can be regarded as uniform without bias, while stopping the pressing drive of the plurality of pressing cylinders,
If the driving distance of any pressing cylinder is not within the uniform range, the driving pressure of the corresponding pressing cylinder is increased or decreased by expanding the upper and lower limits of the target range related to the driving pressure of the pressing cylinder. The horizontal multi-stage press apparatus according to claim 3, which is enabled.
Whether or not the driving distance of the pressing cylinder is within the uniform range is calculated based on the difference between the driving distances of the pressing cylinders detected by the distance detecting unit or the detected value of the driving distance. The horizontal multi-stage press apparatus according to claim 6, wherein the horizontal multi-stage press apparatus is determined based on the inclination of the plate material.
The cylinder controller
When the driving distance of each pressing cylinder reaches the set range with the pressing driving of the plurality of pressing cylinders, the driving pressure of each pressing cylinder detected by the pressure detecting means is within a predetermined target range, and The horizontal type according to claim 3, wherein when the driving distance of each pressing cylinder detected by the distance detecting means is within a uniform range that can be regarded as uniform without deviation, the pressing driving of the plurality of pressing cylinders is stopped. Multi-stage press machine.
Whether or not the driving distance of the pressing cylinder is within the uniform range is calculated based on the difference between the driving distances of the pressing cylinders detected by the distance detecting unit or the detected value of the driving distance. The horizontal multi-stage press apparatus according to claim 8, which is determined by the inclination of the plate material.
The cylinder controller
When the driving distance of each pressing cylinder reaches the lower limit of the set range with the pressing driving of the plurality of pressing cylinders, the driving pressure of each pressing cylinder detected by the pressure detecting means is less than or equal to the upper limit of the predetermined target range. And when the driving distances of the respective pressing cylinders detected by the distance detecting means are within a uniform range that can be regarded as uniform without deviation, the pressing driving of the plurality of pressing cylinders is stopped,
When the driving distance of any of the pressing cylinders is not within the uniform range, the driving pressure can be increased if the driving distance of the corresponding pressing cylinder is less than or equal to the upper limit of the setting range. The horizontal multi-stage press device according to item.
Whether or not the driving distance of the pressing cylinder is within the uniform range is calculated based on the difference between the driving distances of the pressing cylinders detected by the distance detecting unit or the detected value of the driving distance. The horizontal multi-stage press apparatus according to claim 10, wherein the horizontal multi-stage press apparatus is determined based on the inclination of the plate material.
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. In the horizontal multi-stage press apparatus that constitutes the object to be processed by combining them, heats and presses the plate material by pressing from the outside in the overlapping direction of the objects to be processed, and collectively manufactures a plurality of wooden laminated plywoods,
A plurality of pressing cylinders arranged at a plurality of positions different from each other with respect to the plate surface of the plate material, and pressing the object to be processed from the overlapping direction;
A cylinder control unit for controlling the driving of the plurality of pressing cylinders individually or collectively,
Of the plurality of pressing cylinders, a pressing cylinder disposed at least near the reference conveyance surface of the plate material is such that the pressing position of the plate material with respect to the plate surface is unchanged.
One of the long sides of the rectangular plates laminated by applying adhesive to the bonding surface of the single plate is used as the transport reference surface, and each is placed in a standing state between the multiple hot plates and stacked in the thickness direction. Combining them together constitutes the object to be processed, and by driving at least one of the pressing plates disposed on both outer sides of the object to be processed in the overlapping direction, the plate material is thermocompression-bonded, and a plurality of wooden laminated plywoods are bundled together. In the horizontal multi-stage press machine manufactured by
An opening / closing cylinder that is disposed near the center on the pressing surface of the pressing plate, and closes / opens the pressing plate by approaching / separating it,
A plurality of pressing cylinders which are arranged at a plurality of positions different from each other with respect to the pressing surface of the pressing plate so as to surround the opening / closing cylinder, and drive the pressing plate to press the objects to be processed from the overlapping direction. When,
A cylinder control unit for controlling the driving of the plurality of pressing cylinders individually or collectively,
Of the plurality of pressing cylinders, at least a pressing cylinder disposed closer to a conveyance reference plane of the plate member than the opening / closing cylinder has a pressing position with respect to the pressing surface of the pressing plate that is unchanged. Press device.
The plurality of pressing cylinders are:
A plurality of fixed pressing cylinders arranged in a region near the conveyance reference surface of the plate material, and the pressing position of the plate material with respect to the plate surface is unchanged;
And a plurality of movable pressing cylinders arranged in a region far from the conveyance reference surface and capable of changing a pressing position of the plate material with respect to the plate surface with respect to a pressing position of the fixed pressing cylinder. 14. A horizontal multi-stage press apparatus according to item 12 or 13.
The plurality of pressing cylinders are composed of an even number of fixed pressing cylinders whose pressing positions with respect to the pressing surface of the pressing plate are unchanged, and are arranged so as to be point-symmetrical and / or line-symmetrical with respect to the opening / closing cylinder. The horizontal multi-stage press apparatus according to claim 13.